Safety device



Dec. 23, 1930. w. w. CRILEY 1,786,006

SAFETY DEVI CE F iled May 7, 1927 2 Sheets-Sheet 1 INVENTOR. MZ/z'am (J.Crziay ATTORN Y6.

Dec. 23, 1930. w. w. CRILEY 1,786,006

SAFETY DEVI CE Filed May 7, 192 2 Sheets-Sheet 2 INVENTOR. GJW/i'am Z0.Crz'iey 3 Q 0% ZTORIZEQS.

Patented Dec. 23, 1930 UNITED STATES PATENT OFFICE WILLIAM WJCRILEY, OFCLEVELAND, OHIO, ASSIGNOR TO THE AJAX MANUFACTURING COMPANY, OF EUCLID,OHIO, .A CORPORATION OF OHIO SAFETY DEVICE Application filed May 7,1927. Serial No. 189,504.

This invention relates to safety devices, and more particularly safetyconnections in forging machines, punches, presses, and the like.

In machines of such character, it is desirable to provide means forpreventing breakage or stalling of the machine in the event of amming byoversized, misplaced or under-heated material; and it is among theobjects of the invention to provide a construction affording full safetyfor the machine, and in a manner simple and reliable. Other objects willappear as the description proceeds. I

To the accomplishment of'the foregoing and related ends, the invention,then, consists of the features hereinafter fully described, andparticularly pointed out in the claims, the annexed drawing andthe'following description setting forth in detail but one of the variousways in which the principle of the invention maybe employed.

In said annexed drawing Fig. 1 is a detail View of mechanism inaccordance with the present invention; Fig. 2

is a fragmentary showing of suchmechanism in its release position; Fig.3 is a diagrammatic view showing the normal position of the togglepoints Fig. 4: is a longitudinal section through a machine showing apitman embodying the principles of the invention;

Fig. 5 is an enlarged detail; and Fig. 6 is a similar view of amodification, on slightly smaller scale.

Referring more particularly to the drawing, the reference numerals 1 and2 designate slides in a forging machine of well known type, the slide 1being operated in the frame 3 along the guides by a pitman, and theslide2 operating in its guides 4 at right angles to the path of the slide 1,the slides carrying forging dies or the like which cooperate in the wellknown manner. On the slide 1, a pin 5 carries a link 6 which is pivotedto a knuckle 7 in turn pivotally mounted on a fixed pin 8 on the frameof the machine. The other arm of the 45. knuckle 7 is pivotallyconnected with a link 9 which in turn is pivoted to an oscillating out-1 side safety knuckle 10. The latter and an inside knuckle 11 arepivoted in common on a pin 12 fixed to the frame of the machine. Fromthe inside safety knuckle 11 a link-13 connects to knuckle 14 pivoted ona pin 15 fixed to the machine frame. The same link 13 also connects witha link 16 which is connected by pin 17 to the slide 2.

Another link system comprising closed link: 18 and open link 19 isapplied between the knuckles 10 and 11, the said links being pivotallyjoined together at 20 and the link 18 bemg pivoted at its other end atthe point 21,

and thelink 19 being pivoted to the knuckle 10 at the pin 22. This linksystem 18 19, constitutes a toggle, between the lever ends of theknuckles 10 and 11. Normally, this toggle is maintained in slightlydisaligned position,

as indicated in Fig. 1, by a yieldable holding means. This comprisespreferably a yoke bar 24 which seats in recesses in the back of the link19; and extending through openings in the end of the bar bolts 25pivoted from pivot pin 21. I The bolts 25 are surrounded by compressionsprings 26 which are held at their outer extremities by adjusting nuts27.

In operation, it will be seen that the slides 1 and 2 reciprocate intheir respective paths,

at right angles to each other, motion being communicated from the oneslide, for instance slide 1 to the other slide, through the chain oflinks and knuckles forming the associated connecting drive. Normally theknuckle? is rocked about its fulcrum 8, and in turn rocks the knuckle11, which through link 13 straightens the toggle 14, 16, over thefixedfulcrum 15, thus operating the slide 2. If now an unusualresistance to the movement of the slide 2 be encountered as may;

happen from a misplaced blank in the gripping dies of the devlce, or anoversized blank, as the chain of links and knuckles encounters theresistance, the toggle system 18, 19, will yield, against the spring 26,as

shown more specially in Fig. 2. That is, this toggle system yields to anextent sufficient to allow the points 21 and 22 in the system to comecloser together and allow the slide 1 to make its usual excursion, asthrown by its crank for instance, although the slide 2 is absolutelyblocked. No harm is thus done to any portion of the mechanism, and onthe return stroke of the slide 1, the springs 26 immediately straightenup the toggle system 18, 19 into its slightly disaligned position, andthe mechanism proceeds on in its accustomed fashion.

A direct motion mechanism, such for instance as a pitman, may beequipped on similar lines. A pitman on a crankshaft 29, Fig. 4, operatedby a gear drive 30 is shown as actuating slide 1 carrying tools 32, thepitman being made up of members 34 and 35. he members 33 and are pivotedtogether at 31 and the former is provided with an extension 37 and thelatter, an extension 38. Connecting these extensions in turn are links39 and 40 which are pivoted tog-ether intermediately. A yoke bolt 41, ora pair of such, is pivoted to extension 37 and carries a yoke 42 adaptedto rest in a recess in the back of link 39, as backed up by acompression spring 43 and its adjusting nut Vith such mechanism, ifundue resistance be encountered, the joint at pivot 31 bends out fromits normally slightly disaligned position, a strop 45 forming a finallimit, and the yielding of spring 43 allows the toggle system 39, 40 toalso bend out from its normally slightly disaligned position, thusgiving a shortening of distance between points 29 and 36, or ashortening of stroke as required to prevent injury to the press. On thereturn stroke or withdrawal the spring action straightens the togglesback to their normally slightly disaligned position and the pressfunctions as usual.

In the form shown in Fig. 6, a lateral lug on pitman member 47 with itslateral lug 48 has a link 50 which is pivoted to link 49, and yoke bolt51 carries a yoke 52 adapted to rest in a recess in the back of link 49as backed up by a compression spring 53 and its adjusting nut 54. Ifundue resistance be encountered at the die or the like which themechanism is operating, the members 46, 47, toggle out from their normalposition, the toggle system 49, 50 also yielding under the spring, anddamage is prevented. On the return stroke, the pitman straightens backto its normal slightly disaligned position, as indicated by thecentering, and operates as usual.

It will thus be seen that in accordance with my invention, variousjointed thrust members in presses, punches, etc., can be provided withan auxiliary connection which is yieldable when required, to allow thejoint to further move, and entire safety for the machine in all itsoperating portions is provided, and at the same time there is nothing tobe replaced or reset after the safety release. A resulting gain inoperating time is accordingly realized. Moreover especially skilledrepair-men are not required in attendance.

Other modes of applying the principle of the invention may be employed,change being made as regards the details disclosed, provided the meansstated in any of the following claims, or the equivalent of such, beemployed.

I therefore particularly point out and distinctly claim as myinvention 1. In a device of the character described, the combination ofpivotally connected thrust members, reciprocating means for impartingmotion therethrough, and an auxiliary connection between said membersallowing yielding compensatively on abnormal resistance, said connectionincluding pivoted toggle links and a spring yoke extending across onesaid toggle link to the other.

2. In a device of the character described, the combination of pivotallyconnected thrust members, reciprocating means for imparting motiontherethrough, and an auxiliary connection between said members allowingyielding compensatively on abnormal resistance, said connectionincluding two toggle links having their adjacent ends pivoted togetherand their other ends pivoted respectively to the said members, and aspring yoke bridging the toggle.

3. In a device of the character described, the combination of anoscillating knuckle, reciprocating means for imparting motiontherethrough, an oscillated knuckle, and a connection between saidknuckles including two toggle links having their adjacent ends pivotedtogether and their other ends pivoted respectively to the said knuckles,and a spring yoke extending across one link to the other for normallymaintaining the toggle extended.

4. In a. device of the character described, the combination of anoscillating knuckle; an oscillated knuckle; and a connectiontherebetween including two toggle links having their adjacent endspivoted together and their other ends pivoted respectively to the saidknuckles, and a yieldable yoke extending from one knuckle to engage theback of the link pivoted to the other knuckle.

5. In a. device of the character described, the combination of anoscillating knuckle; an oscillated knuckle; and a connection therebetween including two toggle links having their adjacent ends pivotedtogether and their other ends pivoted respectively to the said knuckles,yoke bolts extending from the point of pivoting of one knuckle with thecorresponding toggle link, a yoke bar through which said bolts pass,said bar engaging the back of the other toggle link, and springs betweenthe bolts and bar.

6. In a device of the character described, the combination of anoscillating knuckle; an oscillated knuckle; and a connectiontherebetween including two toggle links having their adjacent endspivoted together and their other ends pivoted respectively to the saidknuckles, paired yoke bolts extending from the point of pivoting of theoscillated knuckle with the corresponding toggle link, a yoke bar havingopenings through which-said bolts pass, said bar engaging seats in theback of the other toggle link, compression springs about said boltsbeyond the yoke bar, and adjusting nuts holding said springs.

Signed by me this 2 day of May, 1927.

WILLIAM W. GRILEY.

